<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    <ul class="box">
        <li class="box1"></li>
        <li class="box1"></li>
        <li class="box1"></li>
    </ul>
</body>
</html>
<style>
    *{
        padding: 0;
        margin: 0;

    }
    .box{
        width: 250px;
        height: 250px;
        background-color: white;
        border: 1px solid black;
        display: flex;
        flex-direction: column;
        list-style: none;
        justify-content: space-between;
        margin: auto;
        border-radius: 5px;
       
    }
    .box1{
        width: 30px;
        height: 30px;
        background-color:red;
        border-radius: 50%;
       
    }
    li:nth-of-type(2){
       align-self: center;
    }
    li:nth-of-type(3){
      align-self: flex-end;
    }
</style>